This is a work in progress. I’m transferring my data from Odoo 11 to Odoo 15 manually. I plan to bring the things I need and to leave the rest, not a complete migration.

I setup Odoo 15 using this guide:

https://linuxize.com/post/how-to-install-odoo-15-on-ubuntu-20-04/

It worked perfectly except I had to set up a password for my odoo15 Postgres user and set it in the /etc/odoo15.conf to get the server to start. Using “db_password = false” prevented the service from starting. Error message “psycopg2.OperationalError: fe_sendauth: no password supplied”

You may also need to specify “xmlrpc_port = 8070” in the config file to avoid a port conflict if you already have a service running on the default port.